Vacuum cleaner



FIG. 1 is top, front and side perspective view of a vacuum cleaner showing my design;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a top, rear and side perspective view thereof. 

The ornamental design for a vacuum cleaner, as shown and described. 